Peter Coeln, founder of the photography museums WestLicht and OstLicht, is one of the very few people Ren Hang ever let accompany him while working. During a stay in Vienna in March 2015, Hang organised a casting for a photoshoot: three naked young people climbing trees, lying in leaves and dipping into the water of the Wien river and the Wienerwald. The book, a follow-up to Wild, shows Hang directing and includes some of the original photographs he created during the shoot, with Coeln's account of the day.